JP3553419B2 - Doctor blade mounting device and its mounting method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a doctor holder mounting device for mounting a doctor blade used in a gravure printing machine or the like to a doctor holder and a method of mounting the same.
[0002]
[Prior art]
For example, in gravure printing, fluid ink is attached to the plate surface, and a thin steel blade called a doctor blade is pressed against the surface of the plate cylinder to scrape off excess ink on the plate surface, leaving only the gravure plate-shaped recesses. Printing is performed while leaving the ink on the paper.
[0003]
In such gravure printing, the doctor blade is held by a doctor holder composed of a doctor pressing lower plate and a doctor pressing upper plate.
[0004]
In many cases, at least two sets of doctor holders holding such doctor blades are prepared for each printing unit. In this case, the doctor blade is replaced outside the machine, or a doctor blade having a polished blade is held in a doctor holder in advance, and when the order is changed, the replacement operation is manually performed for each unit.
[0005]
[Problems to be solved by the invention]
Incidentally, the doctor blade is formed of a thin plate and has a length that can correspond to the length of the plate cylinder. On the other hand, it is a necessary condition that the doctor blade is uniformly pressed against the plate surface. If the blade edge of the doctor blade is in a wavy state, the blade edge of the doctor blade cannot be pressed evenly on the plate surface, causing uneven scraping, thereby leaving residues and dirt on the plate surface, and consequently Print quality will be degraded.
[0006]
A conventional doctor holder comprises a doctor holding lower plate, and a doctor holding upper plate for holding a doctor blade between the doctor holding lower plate, and the doctor holding lower plate and the doctor holding upper plate are fixed by a fixture such as a bolt. Things. However, when mounting with a fixing tool such as a bolt, a plurality of bolts arranged in the longitudinal direction are sequentially tightened, and in some cases, the blade edge of the doctor blade may have ripples. In this case, the above-described problem occurs. Will occur.
[0007]
The present invention has been made in view of such a point, and it is possible to easily and easily attach and detach a doctor blade to and from a doctor holder in a short time without skill, and to prevent a wavy state of the blade edge of the doctor blade. An object of the present invention is to provide a doctor blade mounting device and a mounting method thereof.
[0008]
[Means for Solving the Problems]
The present invention provides a doctor blade mounting apparatus for mounting a doctor blade extending in a band shape to a doctor holder including a doctor pressing lower plate and a doctor pressing upper plate, wherein the doctor pressing lower plate of the doctor holder is placed and the doctor pressing lower plate is mounted. A doctor comprising: a gantry having means for fixing; and a pair of tension blocks provided on the gantry and gripping and pulling both longitudinal sides of a doctor blade disposed on a doctor presser lower plate. In a blade mounting device and a doctor blade mounting method for mounting a doctor blade extending in a strip shape to a doctor holder including a doctor pressing lower plate and a doctor pressing upper plate, a step of mounting and fixing a doctor pressing lower plate of the doctor holder on a gantry. And a pair of tension blocks provided on the pedestal, the doctor tab arranged on the doctor holding plate A step of holding and pulling both sides in the longitudinal direction of the blade, and a step of placing the doctor press upper plate on the doctor blade and fixing the doctor press lower plate and the doctor press upper plate with the fixture. A doctor blade mounting method characterized in that:
[0009]
According to the present invention, the doctor holding plate is placed and fixed on the gantry, and both longitudinal sides of the doctor blade arranged on the doctor holding plate are gripped and pulled by the pair of tension blocks. In this state, by attaching the doctor blade between the doctor holding lower plate and the doctor holding upper plate, it is possible to prevent the blade edge of the doctor blade from waving.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, a doctor blade holder 10 for holding a doctor blade will be described with reference to FIGS. As shown in FIG. 8, a doctor blade holder 10 is arranged on the side of the gravure plate cylinder 1. The doctor blade holder 10 has a doctor pressing lower plate 14 for holding a doctor blade 16 and a doctor pressing upper plate 12, and is moved up and down by a blade moving device 55.
[0011]
As shown in FIG. 8, the plate cylinder 1 is formed by plating the outer periphery of an iron roll or the like, printing a pattern on the drum plating layer by photolithography, etching the plate later, and further performing chrome plating. ing. Therefore, a fine concave portion exists on the surface of the plate cylinder 1 according to the design. Since the ink is supplied to the plate cylinder 1 over the entire width irrespective of the design, the doctor blade 16 is brought into contact with the entire width of the plate cylinder 1 after applying the ink to scrape off excess ink other than the concave portions.
[0012]
Next, the doctor holder 10 will be described with reference to FIGS. The doctor holder 10 includes a doctor pressing upper plate 12 for holding a doctor blade 16 extending in a belt shape and a doctor pressing lower plate 14, and the doctor pressing upper plate 12 and the doctor pressing lower plate 14 are hexagons arranged at equal intervals in the longitudinal direction. It is bolted by a bolt 15. A doctor blade 16 and a back plate 18 are sandwiched between the doctor holding upper plate 12 and the doctor holding lower plate 14. A slight inclination is formed downward at the mating surface portion of the doctor holding lower plate 14 to be sandwiched, so that the doctor blade 16 made of a thin plate (about 0.2 mm) can be made firm. The back plate 18 is made of a spring steel plate of about 0.4 mm.
[0013]
The doctor blade 16 and the back plate 18 protrude from the doctor holding upper plate 12 and the doctor holding lower plate 14, and the size of the protrusion has a close influence on the ink scraping effect of the doctor blade 16. The protruding dimensions are, for example, 25 mm for the doctor blade 16 and 18 mm for the back plate 18.
[0014]
On the opposite side of the doctor blade 16 of the doctor holding upper plate 12 and the doctor holding lower plate 14, a concave portion 12a and a convex portion 14a for alignment are respectively provided. Further, a handle 20 for carrying is provided on the doctor holding upper plate 12.
[0015]
On the other hand, the longitudinal dimension L of the doctor press upper plate 12 and the doctor press lower plate 14 is determined by the web width dimension specification through the printing press. Also, the depth dimension W and the cross-sectional shape of the doctor holding upper plate 12 and the doctor holding lower plate 14 differ depending on the model, and one user may have a plurality of types of doctor holders 10. Further, there is an example in which nine hexagon bolts 15 are used for 1000 mm and are used.
[0016]
Next, a doctor blade mounting apparatus according to the present invention for mounting the doctor blade 16 and the back plate 18 on the doctor holder 10 including the doctor holding lower plate 14 and the doctor holding upper plate 12 will be described with reference to FIGS.
[0017]
As shown in FIG. 1, the doctor blade mounting device grips a pedestal 21 on which a doctor holding plate is placed, and both longitudinal sides of a doctor blade provided on the gantry 21 and placed on the doctor holding plate 14. And a pair of blocks (tensile blocks) 23 and 31 that pull each other.
[0018]
Of these, the gantry 21 serves as a work table, has a height that facilitates work, constitutes a base of the present apparatus, and places the doctor holding lower plate 14 via a pair of receiving stands 22a and 22b. , And supports each member described later. Further, the receiving stands 22a and 22b on the gantry 21 are inclined forward and upward in consideration of workability.
[0019]
Further, an air cylinder 28 that presses the other end of the lower doctor holding plate 14 via a top 29 is provided on the receiving base 22b. The doctor holding lower plate 14 can be pressed and fixed to the side surface of the block 23 by moving the top 29 back and forth by the air cylinder 28.
[0020]
1 and 2 of the pair of blocks 23 and 31 also has a function of fixing the doctor holding plate 14 to the receiving stands 22a and 22b, and one end of the doctor holding plate 14 (see FIG. 1). 2 (the left end of the block 2) comes into contact with the side surface 60 of the block 23. The block 23 has a holding table 26 and a blade holding member 25a which is lowered by the air cylinder 24a and holds the leading end of the doctor blade 16 between the holding table 26 (FIG. 3).
[0021]
The block 23 is attached to the receiving base 22a, and in order to cope with a change in the longitudinal dimension L of the doctor holding lower plate 14 and the doctor holding upper plate 12, the mounting position of the block 23 to the receiving base 22a is set to the doctor position. The lower holding plate 14 and the upper doctor holding plate 12 can be moved in the longitudinal direction. In order to further facilitate the positioning, the block 23 has a convex portion 23a that engages with a plurality of concave portions 27 provided on the receiving table 22a side.
[0022]
Further, a guide member 30 is provided on a surface of the doctor holding plate 14 opposite to the doctor blade 16 for positioning in the depth direction when the doctor holding plate 14 is placed on the receiving tables 22a and 22b. . The guide member 30 is embedded and held in a pair of receiving stands 22a and 22b. The guide member 30 can be attached to and moved to a plurality of locations of the pair of receiving stands 22a and 22b so as to be compatible with the doctor holder 10 of a model having a different depth dimension W.
[0023]
The block 31 on the right side in FIGS. 1 and 2 includes a gripper 32 and a blade gripper 25b that is lowered by the air cylinder 24b and grips the leading side of the doctor blade 16 between the gripper 32. (FIGS. 4 and 5).
[0024]
Here, the block 31 that grips the leading end of the doctor blade 16 is movable along a guide groove 33 provided on the receiving base 22b, and an air cylinder provided on the receiving base 22b via a bracket 34a. By 34, it advances and retreats in the left-right direction of FIG. That is, after the doctor blade 16 is gripped by the blocks 23 and 31 on the original side and the distal side, the block 31 that grips the distal side of the doctor blade 16 is moved rightward in FIGS. 1 and 2 to pull the doctor blade 16. Can be kept in tension.
[0025]
As shown in FIGS. 1 and 6, a pair of clip members 35 are provided between the pair of receiving bases 22a and 22b and near the pair of receiving bases 22a and 22b. This clip fastening member 35 overlaps the back plate 18 on the doctor blade 16, and when these are clamped and tightened between the doctor holding lower plate 14 and the doctor holding upper plate 12, the doctor holding lower plate 14 and the doctor holding This is for holding the doctor blade 16 and the back plate 18 set to a predetermined protrusion size from the presser upper plate 12 until the tightening by the bolt 15 is completed. The pair of clip fastening members 35 are opened and closed by an air chuck 36 and attached to an arm 37. The arm 37 swings between a use position and a retracted position around a support shaft 43 by an air cylinder 38. I have. Note that a normal clip may be used instead of the clip fastening member 35.
[0026]
Further, as shown in FIGS. 1 and 7, after the doctor blade 16 is sandwiched and the doctor holding lower plate 14 and the doctor holding upper plate 12 are tightened with bolts 15, the portion of the doctor blade 16 protruding in the longitudinal direction (see FIG. 1). In order to cut the left and right protruding portions 1, a cutting portion 40 for shear-cutting the doctor blade 16 by the operation of the air chuck 39 is provided near the pair of receiving stands 22 a and 22 b. The cutting section 40 is attached to an arm 41, and the arm 41 swings around a support shaft 43 by an air cylinder 38 between a use position and a retracted position. If the cutting section 40 is not provided, it is also possible to manually use scissors.
[0027]
The doctor blade 16 can be used by unwinding a commercially available long roll 45, and the doctor blade 16 is housed in a box 42 attached to the gantry 21 on the left side of FIG. Have been. In addition, a pair of rollers 61 that nip the doctor blade 16 unwound from the winding body 45 in the box 42 is provided on the box 42, and the doctor blade 16 can be easily sent out by the pair of rollers 61. Alternatively, a handwheel 62 may be attached to the pair of rollers 61.
[0028]
In order to supply air to the air cylinders 24a, 24b, 28, 34, 38 and the air chucks 36, 39, an air pipe or the like is provided, and the air pipe or the like has a manual on-off valve and a regulator. . These air pipes and the like are laid out on the gantry 21 from the air source to the supply port connected to the hose as appropriate. Further, it is preferable to use an air wrench as a tool for bolting the doctor holding lower plate 14 and the doctor holding upper plate 12 with the bolts 15, and air for this purpose can also be supplied from the air piping or the like.
[0029]
Next, a doctor blade attaching method for attaching the doctor blade 16 to the doctor holder 10 will be described.
[0030]
First, the doctor pressing lower plate 14 is placed on a pair of receiving stands 22 a and 22 b provided on the gantry 21 such that the surface of the pressing lower plate 14 opposite to the doctor blade 16 abuts on the guide member 30. . In this case, since the receiving bases 22a and 22b are inclined so that the guide member 30 side faces downward, the holding lower plate 14 can be easily applied to the guide member 30 by utilizing its own weight. Thereafter, the air cylinder 28 provided near the receiving table 22b on the right side of FIGS. 1 and 2 is operated to press the top 29 against the other end (the right end in FIGS. 1 and 2) of the doctor holding plate 14. One end (the left end in FIGS. 1 and 2) of the holding plate 14 is brought into contact with the side surface 60 of the block 23, and the doctor holding plate 14 is fixed between the block 23 and the top 29. At this time, the block 23 is previously mounted on the receiving base 22a at a position corresponding to the longitudinal dimension L of the doctor pressing lower plate 14.
[0031]
Next, the doctor blade 16 is unwound from the winding body 45 in the storage box 42, the doctor blade 16 is disposed on the doctor holding plate 14, and both ends of the doctor blade 16 are gripped by the blocks 23 and 31. It is gripped between the pedestals 26 and 32 and the gripping parts 25a and 25b descending by the air cylinders 24a and 24b.
[0032]
In this case, by contacting the doctor blade 16 with the shoulders 26a, 32a of the grip tables 26, 32, the protrusion dimension of the doctor blade 16 projecting in parallel from the doctor holding plate 14 can be set to a predetermined value. Thereafter, the air cylinder 34 on the block 31 side is operated to move the block 31 to the right in FIGS. 1 and 2, and the doctor blade 16 is pulled and held between the blocks 23 and 31.
[0033]
Next, the back plate 18 is overlaid on the doctor blade 16, the end of the back plate 18 is aligned on the side opposite to the blade edge of the doctor blade 16, the clip fastening member 35 is closed by the operation of the air chuck 36, and the back plate is 18 is held.
[0034]
Thereafter, the doctor press upper plate 12 is superimposed on the doctor press lower plate 14, and the doctor press lower plate 14 and the doctor press upper plate 12 are sequentially moved from the original side to the front side (from left to right in FIGS. 1 and 2). The bolt is tightened by the bolt 15. In this case, using an air wrench makes the work easier.
[0035]
Next, when the bolting is completed, the portions protruding from the doctor holding lower plate 14 and the doctor holding upper plate 12 at both ends of the doctor blade 16 are cut by the cutting section 40.
[0036]
After the above operations are completed, the air cylinders 24a, 24b, 34, 38 and the air chucks 36, 39 are released. Further, the air cylinder 28 is actuated rightward in FIG. 2 to release the fixing of the doctor pressing lower plate 14 on the receiving stands 22a and 22b. Therefore, the doctor holder 10 with the attachment of the doctor blade 16 and the back plate 18 completed can be removed from the receiving stands 22a and 22b of the gantry 21.
[0037]
When replacing the worn / damaged doctor blade 16 used in the printing operation, if the doctor holder 10 is disassembled separately at another work place, the doctor holder having the doctor blade 16 attached in the above procedure is prepared. can do. When the doctor holder 10 is brought without being disassembled, it is disassembled in an empty space on the front side of the gantry 21 or placed on the receiving stands 22a and 22b while being assembled, and the doctor presser lower plate 14 is After fixing, the bolt 15 can be loosened and disassembled.
[0038]
As described above, according to the present embodiment, the doctor holding lower plate 14 and the doctor holding upper plate 12 are sequentially bolted from the ends with the bolts 15 in a state where the doctor blade 16 is held in tension between the pair of blocks 23 and 31. The doctor blade 16 can be easily attached to the doctor holder 10 while preventing the doctor blade 16 from waving, by bolting. In addition, the doctor blades 16 and the back plate 18 can always keep the protrusion dimensions constant, so that the doctor blades 16 can be stably mounted without any variation in the doctor holders 10.
[0039]
For this reason, it is possible to reduce the occurrence of poor scraping by the doctor blade 16 and reduce the wear of the blade, and to improve the print quality using the doctor blade 16. Further, workability (safety, simplicity, time) in handling the doctor blade 16 is improved.
[0040]
【The invention's effect】
As described above, according to the present invention, when the doctor blade is sandwiched between the doctor pressing lower plate and the doctor pressing upper plate, it is possible to prevent the blade edge of the doctor blade from waving. For this reason, it is possible to precisely scrape the ink on the printing cylinder by the doctor blade, and it is possible to improve the printing quality.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a doctor blade mounting device according to the present invention.
FIG. 2 is a front view showing one embodiment of a doctor blade mounting device according to the present invention.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a sectional view taken along line BB of FIG. 2;
FIG. 5 is an enlarged view of a front block.
FIG. 6 is an enlarged view showing a clip fastening portion.
FIG. 7 is an enlarged view showing a cutting portion.
FIG. 8 is a view showing a doctor holder and a gravure plate cylinder.
FIG. 9 is an enlarged view of a doctor holder.
FIG. 10 is a plan view of a doctor holder.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 doctor holder 12 doctor holding upper plate 14 doctor holding lower plate 16 doctor blade 18 back plate 21 pedestals 22 a and 22 b cradle 23, 31 blocks 24 a, 24 b, 28, 34 air cylinders 25 a, 25 b blade gripping member 29 frame 35 clip fastening member 40 Cutting part

Claims (6)

In a doctor blade mounting device for mounting a doctor blade extending in a band shape to a doctor holder including a doctor pressing lower plate and a doctor pressing upper plate,
A gantry having means for mounting the doctor holding plate of the doctor holder and fixing the doctor holding plate,
A doctor blade mounting device, comprising: a pair of tension blocks provided on a gantry and gripping and pulling both longitudinal sides of a doctor blade disposed on a doctor holding plate. 2. The doctor blade mounting device according to claim 1, further comprising a clip fastening member for holding the back plate disposed on the doctor blade at the doctor plate. 2. The doctor blade mounting apparatus according to claim 1, further comprising a cutting portion for cutting both longitudinal end portions of the doctor blade mounted between the doctor press lower plate and the doctor press upper plate on the gantry. A doctor blade mounting method for mounting a doctor blade extending in a band shape to a doctor holder including a doctor pressing lower plate and a doctor pressing upper plate,
Placing the doctor holder lower plate of the doctor holder on the gantry and fixing it,
By a pair of tension blocks provided on the gantry, a step of gripping and pulling both sides in the longitudinal direction of the doctor blade arranged on the doctor pressing lower plate,
Mounting the doctor press upper plate on the doctor blade, and fixing the doctor press lower plate and the doctor press upper plate with a fixing tool. 5. The method according to claim 4, further comprising a step of arranging the back plate on the doctor blade after holding and pulling both sides in the longitudinal direction of the doctor blade, and holding the back plate to the doctor blade by a clip fastening member. The described doctor blade mounting method. 5. The doctor blade mounting method according to claim 4, further comprising the step of fixing the doctor holding lower plate and the doctor holding upper plate with a fixture, and then cutting both longitudinal end portions of the doctor blade with cutting portions. .

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